/*
 * jQuery UI Accordion
 *
 * Copyright (c) 2007, 2008 Jörn Zaefferer
 * Dual licensed under the MIT (MIT-LICENSE.txt)
 * and GPL (GPL-LICENSE.txt) licenses.
 *
 * http://docs.jquery.com/UI/Accordion
 *
 * Depends:
 *	ui.core.js
 */
(function($) {

    $.widget("ui.accordion", {
        init: function() {
            var options = this.options;

            if (options.navigation) {
                var current = this.element.find("a").filter(options.navigationFilter);
                if (current.length) {
                    if (current.filter(options.header).length) {
                        options.active = current;
                    } else {
                        options.active = current.parent().parent().prev();
                        current.addClass("current");
                    }
                }
            }

            // calculate active if not specified, using the first header
            options.headers = this.element.find(options.header);
            options.active = findActive(options.headers, options.active);

            // IE7-/Win - Extra vertical space in Lists fixed
            if ($.browser.msie) {
                this.element.find('a').css('zoom', '1');
            }

            if (!this.element.hasClass("ui-accordion")) {
                this.element.addClass("ui-accordion");
                $("<span class='ui-accordion-left'/>").insertBefore(options.headers);
                $("<span class='ui-accordion-right'/>").appendTo(options.headers);
                options.headers.addClass("ui-accordion-header").attr("tabindex", "0");
            }

            var maxHeight;
            if (options.fillSpace) {
                maxHeight = this.element.parent().height();
                options.headers.each(function() {
                    maxHeight -= $(this).outerHeight();
                });
                var maxPadding = 0;
                options.headers.next().each(function() {
                    maxPadding = Math.max(maxPadding, $(this).innerHeight() - $(this).height());
                }).height(maxHeight - maxPadding);
            } else if (options.autoHeight) {
                maxHeight = 0;
                options.headers.next().each(function() {
                    maxHeight = Math.max(maxHeight, $(this).outerHeight());
                }).height(maxHeight);
            }

            options.headers
                    .not(options.active || "")
                    .next()
                    .hide();
            options.active.parent().andSelf().addClass(options.selectedClass);

            if (options.event) {
                this.element.bind((options.event) + ".accordion", clickHandler);
            }
        },
        activate: function(index) {
            // call clickHandler with custom event
            clickHandler.call(this.element[0], {
                target: findActive(this.options.headers, index)[0]
            });
        },
        destroy: function() {
            this.options.headers.next().css("display", "");
            if (this.options.fillSpace || this.options.autoHeight) {
                this.options.headers.next().css("height", "");
            }
            $.removeData(this.element[0], "accordion");
            this.element.removeClass("ui-accordion").unbind(".accordion");
        }
    });

    function scopeCallback(callback, scope) {
        return function() {
            return callback.apply(scope, arguments);
        };
    }

    ;

    function completed(cancel) {
        // if removed while animated data can be empty
        if (!$.data(this, "accordion")) {
            return;
        }

        var instance = $.data(this, "accordion");
        var options = instance.options;
        options.running = cancel ? 0 : --options.running;
        if (options.running) {
            return;
        }
        if (options.clearStyle) {
            options.toShow.add(options.toHide).css({
                height: "",
                overflow: ""
            });
        }
        $(this).triggerHandler("accordionchange", [$.event.fix({type: 'accordionchange', target: instance.element[0]}), options.data], options.change);
    }

    function toggle(toShow, toHide, data, clickedActive, down) {
        var options = $.data(this, "accordion").options;
        options.toShow = toShow;
        options.toHide = toHide;
        options.data = data;
        var complete = scopeCallback(completed, this);

        // count elements to animate
        options.running = toHide.size() === 0 ? toShow.size() : toHide.size();

        if (options.animated) {
            if (!options.alwaysOpen && clickedActive) {
                $.ui.accordion.animations[options.animated]({
                    toShow: jQuery([]),
                    toHide: toHide,
                    complete: complete,
                    down: down,
                    autoHeight: options.autoHeight
                });
            } else {
                $.ui.accordion.animations[options.animated]({
                    toShow: toShow,
                    toHide: toHide,
                    complete: complete,
                    down: down,
                    autoHeight: options.autoHeight
                });
            }
        } else {
            if (!options.alwaysOpen && clickedActive) {
                toShow.toggle();
            } else {
                toHide.hide();
                toShow.show();
            }
            complete(true);
        }
    }

    function clickHandler(event) {
        var options = $.data(this, "accordion").options;
        if (options.disabled) {
            return false;
        }

        // called only when using activate(false) to close all parts programmatically
        if (!event.target && !options.alwaysOpen) {
            options.active.parent().andSelf().toggleClass(options.selectedClass);
            var toHide = options.active.next(),
                    data = {
                        options: options,
                        newHeader: jQuery([]),
                        oldHeader: options.active,
                        newContent: jQuery([]),
                        oldContent: toHide
                    },
                    toShow = (options.active = $([]));
            toggle.call(this, toShow, toHide, data);
            return false;
        }
        // get the click target
        var clicked = $(event.target);

        // due to the event delegation model, we have to check if one
        // of the parent elements is our actual header, and find that
        // otherwise stick with the initial target
        clicked = $(clicked.parents(options.header)[0] || clicked);

        var clickedActive = clicked[0] == options.active[0];

        // if animations are still active, or the active header is the target, ignore click
        if (options.running || (options.alwaysOpen && clickedActive)) {
            return false;
        }
        if (!clicked.is(options.header)) {
            return;
        }

        // switch classes
        options.active.parent().andSelf().toggleClass(options.selectedClass);
        if (!clickedActive) {
            clicked.parent().andSelf().addClass(options.selectedClass);
        }

        // find elements to show and hide
        var toShow = clicked.next(),
                toHide = options.active.next(),
            //data = [clicked, options.active, toShow, toHide],
                data = {
                    options: options,
                    newHeader: clicked,
                    oldHeader: options.active,
                    newContent: toShow,
                    oldContent: toHide
                },
                down = options.headers.index(options.active[0]) > options.headers.index(clicked[0]);

        options.active = clickedActive ? $([]) : clicked;
        toggle.call(this, toShow, toHide, data, clickedActive, down);

        return false;
    }

    ;

    function findActive(headers, selector) {
        var showIndex = 0;
        if (typeof unitShowIndex == "number") {
            showIndex = unitShowIndex;
        }
        return selector != undefined
                ? typeof selector == "number"
                ? headers.filter(":eq(" + selector + ")")
                : headers.not(headers.not(selector))
                : selector === false
                ? $([])
                : headers.filter(":eq(" + showIndex + ")");
    }

    $.extend($.ui.accordion, {
        defaults: {
            selectedClass: "selected",
            alwaysOpen: true,
            animated: 'slide',
            event: "click",
            header: "a",
            autoHeight: true,
            running: 0,
            navigationFilter: function() {
                return this.href.toLowerCase() == location.href.toLowerCase();
            }
        },
        animations: {
            slide: function(options, additions) {
                options = $.extend({
                    easing: "swing",
                    duration: 300
                }, options, additions);
                if (!options.toHide.size()) {
                    options.toShow.animate({height: "show"}, options);
                    return;
                }
                var hideHeight = options.toHide.height(),
                        showHeight = options.toShow.height(),
                        difference = showHeight / hideHeight;
                options.toShow.css({ height: 0, overflow: 'hidden' }).show();
                options.toHide.filter(":hidden").each(options.complete).end().filter(":visible").animate({height:"hide"}, {
                    step: function(now) {
                        var current = (hideHeight - now) * difference;
                        if ($.browser.msie || $.browser.opera) {
                            current = Math.ceil(current);
                        }
                        options.toShow.height(current);
                    },
                    duration: options.duration,
                    easing: options.easing,
                    complete: function() {
                        if (!options.autoHeight) {
                            options.toShow.css("height", "auto");
                        }
                        options.complete();
                    }
                });
            },
            bounceslide: function(options) {
                this.slide(options, {
                    easing: options.down ? "bounceout" : "swing",
                    duration: options.down ? 1000 : 200
                });
            },
            easeslide: function(options) {
                this.slide(options, {
                    easing: "easeinout",
                    duration: 700
                });
            }
        }
    });

    // deprecated, use accordion("activate", index) instead
    $.fn.activate = function(index) {
        return this.accordion("activate", index);
    };

})(jQuery);
